What is the difference between localStorage and sessionStorage?

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In web development, localStorage and sessionStorage are both part of the Web Storage API, which allows storing data in the browser without using cookies. They are very similar in usage (both store data as key-value pairs in strings) but differ mainly in lifetime and scope.

1. localStorage

• Data stored in localStorage has no expiration.

• It persists even after the browser is closed and reopened.

• Data remains until it is manually deleted (by code or user clearing the browser).

• Useful for storing long-term data like user preferences, theme settings, or saved items in a shopping cart.

Example:

localStorage.setItem("theme", "dark");
console.log(localStorage.getItem("theme")); // "dark"

2. sessionStorage

• Data stored in sessionStorage lasts only for the duration of the page session.

• It is cleared automatically when the tab or browser window is closed.

• Data is not shared across tabs; each tab has its own sessionStorage.

• Useful for temporary data like form inputs or data relevant only while the user is on that page.

Example:

sessionStorage.setItem("user", "Alice");
console.log(sessionStorage.getItem("user")); // "Alice"

Key Differences:

• Persistence: localStorage is permanent until cleared, while sessionStorage disappears after session ends.

• Scope: localStorage is shared across all tabs of the same origin, but sessionStorage is restricted to the tab that created it.

• Use Cases: localStorage → settings, tokens, caching. sessionStorage → temporary session data.

In short, use localStorage for long-term storage and sessionStorage for short-term storage within a single browsing session.

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